Skip to main content

Full text of "Practical Organic Chemistry"

See other formats


APPENDIX

337



I

Adds.—A free acid may be at once identified by its solubility
in a solution of sodium carbonate and by being reprecipitated
by concentrated hydrochloric acid. If a metal has been dis-
covered in the preliminary examination, a careful examination
must be made for an organic acid. As the substance is insoluble
in water the metal will probably not be an alkali metal. Boil
the substance with sodium carbonate solution. The sodium
salt of the acid passes into solution and the metallic carbonate
is precipitated. Filter ; boil the filtrate with a slight excess of
nitric acid, add excess of ammonia and boil until neutral, tests
may then be applied in order to identify one of the common
acids and the m.p. determined ; but beyond this it is impossible
to carry the investigation in a limited time.

INSOLUBLE SOLIDS.                                   ;

(Containing C and H, or C, H, and O.)


	Melting-point.
	
	Melting-point.    I

llydroca rbons — Paraffin wax ......
	45 — 60
	Acids — (continued) Anisic .........
	184        •

Naphthalene (p. ^16) .   .
	So
	<?-Toluic
	

Anthracene (p. 225)    .   .
	217
	
	1 jo

Phenanthrene   ....
	OQ
	jj.                 CQ     no)
	

Stilbene .  ......
	125
	Phenyl acetic   .....
	76

A Icohols —
 Cetyl Alcohol
	cjo
	0-Phthalio (p. 217) •  .   . I        tn-     „     (isophthalic    . if             (terephthalic)
	subl.

Menthol     .          ....
	42
	(p   171)
	"

A Idehydes — Vanillin
	Oj
	A nkydrides —
	4'j

Piperonal
	
	Phthalic(p. 218).   .  .   .
	i-S

Kc tones —
	
	Phenols — 0-Cresol         .      .
	

Benzil (p. 202) .....
	48 95
	/-    „     (p. 164)  .... Thymol .
	36


	*37
	a-Naphlhol   ......
	95

Quinones — • Benzoquinone (p. 192)   . o-Naphthaquihone .   .   . 0-            „                .-.
	116
 125 115 — 1 20
	£-       „        (p. 219)   .   .
 Esters—
 Methyl oxalate (p. 101) . Cetyl    palmitate   (Spermaceti)   .....
	J2'J
 54
 r-^

Anthraquinone (p. 225) .
	aC5
	Myricyl palmitate (Bees wax)   ......
	02 --- 65

Acids — Palmitic (p. 104) .... Stearic        .  .      ...
	205
 6-3
 69
	Glyceryl       "tripalmitate (Palmitin) (p. 104) . Glyceryl  _   tristearate (Stearin)
	62

Benxoie (p. 199)   .... tf-Hydroxybenzoic (p. 190) S      in-            .,             (p. 201)
 •^ /•      ;.
	155
 2OO 21O
	Phenyl benzoate .... ,,    " salicylate    .  .   . Benzyl benzoate   .... ,,      salicylate ....
	69
 43
 21

COHEN'S ADV. P. O. C.

i)